Yes, you can lay turf over existing grass, but it is usually not recommended except as a short-term, small-scale fix. New turf laid directly over an old lawn often struggles to root into the soil beneath it, which limits its long-term health. For a lasting lawn, removing the existing grass first gives far better results.
TL;DR:
- Laying turf over existing grass is suitable mainly for small patches and only when the turf is healthy, weeds are minimal, and the underlying soil is well-drained and not compacted.
- Shallow rooting, weed regrowth, uneven settling, and unresolved soil issues are common problems when turf is laid over old grass rather than removing it first.
- To improve success, prepare the site by mowing low, scarifying existing grass, spreading quality topsoil, and ensuring proper watering within the first few weeks.
- Removing the old lawn and properly grading and topsoiling the soil provides a more reliable, long-term lawn than overlaying, taking more time but reducing risks of failure.
- Professional turf installation services are available to ensure proper preparation, especially for larger areas or full relays, minimizing the chances of needing repeat work within a year.
Overlaying turf is sometimes a sensible option, but only under fairly narrow conditions. It suits small, cosmetic jobs rather than whole-of-yard installations, and it works best when the existing lawn is already in reasonable shape.
Conditions worth checking before you consider it:
Even when these boxes are ticked, overlaying should be treated as a stopgap rather than a permanent solution. The new turf sits on top of an existing root mat instead of bedding into open soil, so it tends to establish more slowly and need closer attention in its first few months. Homeowners choosing this route should expect a shorter lifespan from the repair and a higher chance of needing follow-up work within a year or two.
Pro Tip: If you are only patching a small bare or damaged section, overlaying can work well. For anything larger than a few square metres, removal first is the safer bet.
Overlaying turf skips the one step that most affects whether a lawn survives long term: giving new roots clean, workable soil to grow into. Several problems tend to show up once the new turf has been down for a few months.
Root depth matters more than most homeowners expect. Healthy turf can send roots down to significant depths, commonly over 200 millimetres in good conditions in good conditions, but a layer of old grass and thatch between the new turf and the soil can block that development before it starts.
If you have weighed the risks and still want to overlay, following a careful process reduces the chance of early failure.
Pro Tip: Keep newly cut turf moist and lay it within 36 hours where possible. Research on turf handling shows delays between harvest and laying reduce how quickly roots establish.
Treat overlay jobs as a short-term repair rather than a finished lawn. Watch for warning signs over the following months, including:
If these appear early, it usually means the underlying issues were bigger than the overlay could manage.
Removing the old lawn and starting with a clean soil profile is the more reliable path for anything beyond a small patch. It lets you fix the problems that overlaying cannot touch: compaction, poor drainage and shallow topsoil.
Soil guidance for turf installation recommends around 150 millimetres of good-quality topsoil for solid root development and drought tolerance, a figure echoed in Lawn Solutions Australia’s preparation specifications. Before that topsoil goes down, the subgrade needs attention too, including ripping compacted subsoil and grading the site at a gentle 1 to 4% fall away from buildings to stop water pooling against foundations.
Before committing to a full strip-and-relay, weigh up:
For readers who decide a proper relay makes more sense than patching over old grass, Greener Lawn’s Turf Laying Service handles the job from site preparation through to the final roll, which suits anyone who would rather not manage compaction testing, grading and laying technique themselves. For DIY relays, the Turf Underlay 1t Bulka Bag gives you enough volume to reach proper topsoil depth without guesswork on quantities.
If you are choosing a variety for a hot, sun-exposed yard, TifTuf Bermuda is bred for drought tolerance and recovers well once established. As turf is harvested from mature crops and supplied direct from the farm, timing delivery close to your laying date helps the roots settle in sooner.
Whether you are patching a small section or planning a full relay, Greener Lawn supplies turf varieties and lawn care products direct from the farm, so you are not stuck guessing at quality or waiting on a middleman. Browse the full range, including Sir Walter DNA Certified Buffalo, TifTuf Bermuda, Sir Grange Zoysia and six more varieties, alongside underlay, top dressing and starter fertilisers to support establishment.
For anyone who has decided removal and a proper relay is the safer route but would rather not do the heavy lifting, the Turf Laying Service takes care of preparation and installation, backed by advice from a Lawn Solutions Australia partner. Check turf delivery options for your area and get your new lawn started on the right footing.
A few references back up the guidance above and are worth a look if you want more detail before starting your own project:
The new turf sits on top of the old root mat instead of bedding into open soil, which often leads to shallow rooting and a lawn that struggles in dry weather. Old grass or weeds underneath can also regrow through the new turf within weeks.
It can work for small, cosmetic patch repairs where the existing lawn is healthy and the soil is not compacted. For a full lawn replacement, removing the old grass first and preparing the soil properly gives far more reliable results.
Technically yes, but it is only advisable for small areas and should be treated as a short-term fix rather than a permanent lawn. Larger areas with drainage issues, compaction or significant weed presence need the old lawn removed first.
Old grass can be removed by hand with a turf cutter or spade, or killed off with a non-residual herbicide and left to break down before cultivation. Either way, the goal is to leave a clean, cultivated soil surface that is roughly 150 millimetres deep, giving new turf room to root properly.